Free: Contests & Raffles.
I have a buddy in Jackson Hole, WY who has great success banging pretty tourists by inviting them to go out and "hear the wolves howl." He builds a fire, breaks out a bottle of wine and 2 glasses - occasionally they even hear wolves howl.
Why not, people pay to go out on a tour of the ocean or sound looking for whales....Can you bait wolves in close for viewing?